Is the <span style = 'background-color: #dae8f4'>lump</span> tender or painful? Is there any redness in the <span style = 'background-color: #dae8f4'>area</span>? The antibiotics could have helped clear the bacteria and thus, the area may no longer present any pain or redness if these were present initially.
A scrotal ultrasound may be able to help ascertain the cause of the swelling. A regular testicular examination will also be able to help.
Here is a url to help you with the testicular examination:
http://www.usrf.org/video_tomgreen/tcexam.

Hi, I have been getting a boil or a bump in my <span style = 'background-color: #dae8f4'>pubic</span><span style = 'background-color: #dae8f4'>area</span>. It comes back around the same spot every 2-3 months or so. The top is pretty soft and around the bottom/base its hard, and about a dime in size. I'm 19 and have not been sexually active as yet. The boil takes about a week to burst and its all blood that comes out. And just lately this same boil has shown up a couple inches from where it used to show up, can you help me? PS I am a male.

It felt tender and it had a white head <span style = 'background-color: #dae8f4'>on</span> it much like a pimple. It also felt like there was a hard <span style = 'background-color: #dae8f4'>lump</span> under the white head. I have sever acne on my face, chest and back with a lot of white heads so I thought maybe it was just a pimple. I popped it and yellow/whitish puss came out (much like the pimples I have) and it bled a bit. I cleaned it and it went away. A week later three of these pimple-like things showed up.

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